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Sorry to hear that, open all the covers > remove both SIM and SD cards > place your phone inside a bowl with rice and let it sit for 1 or 2 days
It could help, you should request a vacuum test
Here is a picture of the disaster:
I wouldn't bother trying to dry the phone out. Just return it for a replacement. After all one of it's key features is that it it IP58 rated and if it fails a small dunk or gentle wash then the phone is defective.
A kudos to Sony. I had the same issue as the OP, but had taken a video of my testing the phone in water that proved that I had the hatches closed and showed where the leak was. After some issues getting the paperwork to send it in, I had a replacement unit within a few days. Tested it and so far so good. Thanks Sony!